I Have a workbook with 31 sheets and want data from an other workbook to be pasted in the sheet which is empty

I populate data from a file called book6 with 4 sheets named 05,96,sp4,cust into 4 other woorkbooks with 31 sheets. I copy the data from sheet 05 into an empty sheet in 1 of the workbook. I need a macro to do so and not to overwrite any sheet with data